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That is a pipe that used to be sold at Hugh M Woods or Builders Square, I believe it was called jet pipe and it had its own size fittings which aren't available anymore. You might be able to use a piece of 3/4 PVC and install it like a coupling and put two screw clamps on each side. It's not fun stuff to work with.

I just dealt with a homeowner system the other day.. The main piping was a 3/4" black tubing that was very thick and flexible.. My 3/4 barbed fittings were very loose and the 1" was too big.

I had to do a repair..

Basically I heated up the hose line some and stuffed a 1" barbed fitting , using 3 hose clamps. It was a very good solid connection/ repair. Though I told the homeowner that none of this is going to be warrantied if it leaks.

It is standard black poly hose, looks like your typical 3/4" black poly sprinkler hosing found at Home Depot, it is just BARELY larger though, a 3/4" barb fitting slips in easily, which of course fits nice and snug in typical 3/4", which is of course causing it to leak... I stuck some calipers to it, a standard 3/4" comes in at JUST under 1" OD, this guy comes in at just over 1" OD, so maybe a 1/16" difference in OD... Any idea what I have, or if they make a barb fitting JUST slightly larger than a 3/4", maybe 13/16"?...lol

WHAT THE HELL SIZE IS THIS?????...lol

Hey fellas, I'm new to the site and have an issue that I could REALLY use some help with. I've recently purchased a home and it has an older sprinkler system, probably 80's I'm guessing. I've gotten the system into 100% working order, the only problem is that there's 3 lines that need repairs from getting whacked with a spade or something, but I've cut out the small sections as I normally would, and normally I'd stick in a 3/4" male/male adapter with a couple hose clamps, at least that's what I've always done in the past. The problem is, the 3/4" adapters just don't fit properly, they're just a tiny bit loose, which is causing them to still leak a little, I've tried gluing them in with no luck, yet the pipe seems to be about the exact same size that you'd find in Home Depot (3/4"), is it a thin wall pipe or something? What is the best way to patch these up and have a long lasting repair that I won't have to worry about, of course short of replacing the entire lines?...lol Any help would be greatly appreciated...